Quizzes and Practice Systems

Answer: A. 34 unique types (9+9+9 suits + 4 winds + 3 dragons), each appearing 4 times = 136 total tiles.

Answer: B. Standard: 4 mentsu + 1 jantai = 14 tiles. Chiitoitsu (7 pairs) and kokushi are exceptions.

Answer: B. Furiten blocks ron (claiming discards) but NOT tsumo (self-draw). You can still win by drawing the tile yourself.

Answer: C. 9p has some value as it could connect if you draw 7p or 8p (though your hand already has 7s8s). But the isolated honor with no yakuhai value is the worst tile. Between 3z (West) and 6z (hatsu), if West is not your wind, discard West first—hatsu is yakuhai and has more value as a potential pair→triplet.

Answer: A. Win rate is primarily driven by acceptance count. 7 remaining tiles beats 3 remaining tiles by a large margin. Deceptiveness helps against ron opportunities but does not affect tsumo probability.

Answer: A. At 1-shanten with mangan+ potential and a relatively safe discard (suji, ~85-90% safe), the expected value of pushing is positive. The potential gain (8,000+ points) multiplied by your reasonable win probability outweighs the risk. However, this should be reassessed each turn—if subsequent discards are dangerous and you do not improve, transitioning to fold becomes correct.

Answer: Corrected to 50 fu. Base: 20. Closed ron: +10. Closed triplet of 1p (terminal ankou): +8. Open triplet of East (terminal/honor minkou): +4. Sequences: +0 each. Kanchan wait: +2. Total: 20+10+8+4+2 = 44, rounded up to 50 fu. Note how closed terminal triplets contribute significantly more than open ones.

Answer: A. With only 1,500 points separating 1st and 2nd in all-last, the placement risk of dealing in massively outweighs the marginal benefit of winning a 2-han hand (which keeps you in 1st either way). Fold and protect your lead. The uma difference between 1st and 2nd (+30k vs +10k, typically 20,000 point swing) makes this an easy fold.

Answer: B. Pinfu requires ALL sequences (no triplets). This hand has a triplet (8s8s8s), disqualifying pinfu. The pair is 2z (South), which IS the seat wind, giving +2 fu for the pair but NOT providing yakuhai (yakuhai requires a triplet, not a pair). Tanyao fails because the hand contains 2z (honor). So the only yaku is menzen tsumo (1 han). The 8s triplet and South pair add fu but no additional yaku.

Answer: A. 4z and 1m are both genbutsu (in the opponent's discards)—100% safe. Between them, both are equally safe, but 4z (honor) has less future value for your hand than 1m might. 6m has suji protection: 9m is in discards, and the 3-6-9 suji means a ryanmen involving 6m (specifically 7m-8m waiting on 6m/9m) is eliminated because 9m is safe. So 6m is suji-safe against ryanmen. 5s has no suji protection and is a dangerous center tile—most likely to be a winning tile.

Answer: B. 2z (South wind) is a guest wind — not your seat wind (West) and not the round wind (East). It has zero yaku potential and cannot form sequences. It is the purest "dead tile" in your hand. While 1z (East = round wind) has yakuhai potential if you draw two more, and 5z (haku) and 7z (chun) are always yakuhai-eligible, 2z has no such potential. 1m is a terminal but at least has suited connectivity (could connect with 2m-3m draws). Discard 2z first.

Answer: C (debatable, but best value-aware choice). You hold two 5m tiles, each worth 1 dora = 2 bonus han total. Keeping both is extremely valuable. The 7z pair provides the jantai (pair) for the winning hand structure. If you discard 3m, your hand becomes: 4m-5m-5m | 3p-4p-5p-6p-8p | 4s-5s-6s | 7z-7z — still with strong development toward tenpai. Discarding 8p (option A) ignores the value of extending the pinzu block. Discarding 7z (option B) removes your pair — you would need to find a new pair elsewhere. Discarding 5m (option D) throws away a dora for marginal efficiency gain. This is a textbook efficiency-vs-value problem where keeping dora is correct even at slight efficiency cost.

Answer: A. The gap to 2nd is only 2,500 points. A 1-han 30-fu ron (1,000) from 2nd gives you 26,000 vs their 26,500 — NOT enough. A 2-han 30-fu ron (2,000) gives you 27,000 vs their 25,500 — you overtake. Riichi pushes you from 1 to 2 han, crossing the threshold needed to move up a placement. The 20,000-point uma difference between 2nd and 3rd makes this riichi mandatory despite the defensive risk. This is a classic all-last calculation where the riichi decision is driven by point-gap arithmetic, not by generic "is riichi good" heuristics.